396-3815Y1 SureFire PumpRight for Raven RCM 18 Revised 12/04/2019
Dual Metering Tube Plumbing Kits with
Dual Check Valve
For more information, read Navigating the Metering Tube Maze or Metering Tube /
LiquiShiftTube Charts.
SureFire dual metering tube plumbing kits are a great way to apply fertilizer.
These plumbing kits will contain everything you need to distribute fertilizer from the flowmeter outlet down to
the ground application device of your choice (not included).
These instructions will show you where all the pieces go. It will provide guidance on how much metering tube
to use. There are some optional fittings included
in each plumbing kit. These instructions will show
you where and why you’d want to use the optional
pieces.
The dual check valve assembly is a key piece in
the dual metering tube design. In addition to a
check valve to stop fertilizer from draining when
the system is shut off, each check valve has an
on/off valve on top of it. These on / off valves
allow the operator to turn on only tube 1, only
tube 2, or both tube 1 and 2. This provides for
three different application ranges, which is
especially helpful when using a fertilizer which
has a highly variable viscosity based on
temperature changes or when changing rates
from field to field.
Dual Advantage of Dual Metering Tube
Metering tube provides a larger passage way diameter than a
comparable orifice. For a 5 GPA rate on 30” rows, a size
0.046” orifice would be used. For the same rate a 0.110” meter
tube that is 8’ long would be used. This 8’ tube with more than
twice the diameter creates a fertilizer system resistant to plug-
ging while providing excellent row to row distribution.
By using two metering tubes, the fertilizer system can handle a
wider range of rates and provide the proper system pressure
as the fertilizer properties change due to temperature, mixtures
and other factors.
Standard Orifice Metering Tube
2x-3x
Larger
The dual metering tube allows for three application
rate ranges. Some fertilizers have a widely variable
viscosity. Therefore, based on temperature, tank
mixing and fertilizer batch, the best tube to use will
change.
SureFire recommends you start with the larger tube
ON only. This is the middle size and is a good start-
ing point. Conduct a test using the Nozzle Flow
Check with fertilizer to determine your system pres-
sure. If pressure is below 15 psi, some check
valves may not open and row to row distribution will
be uneven.
Start with larger tube ON, smaller tube OFF:
• Pressure below 15 PSI: Turn larger tube OFF
and smaller tube ON.
• Pressure over 50 PSI: Turn BOTH tubes ON.
Field Operation of Dual Metering Tube -
Dual Check Valve System
Blue Tube
(smaller)
Green Tube
(larger)
GPA on 30” rows (approx,
will vary)
Blue Tube 1.5 - 3
Green Tube 3 - 6
Blue & Green Tube 6 - 10
Minimum Recommended
flow for Blue Tube (8 ft)
4 - 5 oz/min
** Ultra Low Rate Application –For rates from 2-5 oz/min/row use a 12 foot length of metering tube.
To calculate oz/min/row: Oz/min/row = (GPA x MPH x spacing (inches)) ÷ 46.4
On/Off
Valves
B
Components
Liquid
Other tubes are available if needed for different application rates.
Not actual
size
To Next Page
Loading...
